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Network Formation in Poly(ethylene Terephthalate) by Thermooxidative Degradation by Kentaro Yoda; Akio Tsuboi; Minoru Wada; Reizo Yamadera is a Materials Science article available to read on EtoBox.

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## Abstract Gelation of poly(ethylene terephthalate) by heating at 263°–300°C was investigated. Under nitrogen flow, crosslinks were scarcely formed. However in air, degradation and crosslinking were common, and these were accelerated by purging gaseous and sublimable degradation products out of the system with a stream of air. The main component of the sublimate was terephthalic acid. Infusible and insoluble gel was treated with methanol at 260°C, and then the methanolysis products were separated into two parts. The methanol‐insoluble part exhibited a polyene structure with ester groups, and the methanol‐soluble part contained dimethyl terephthalate, ethylene glycol, and some 1,2,4‐butanetriol. To clarify the relation between the crosslinking and the formation of vinyl ester groups, the degradation of vinyl methyl terephthalate was studied. Thermoxidative degradation of linear polyesters other than poly(ethylene terephthalate) was also studied. Poly(ethylene isophthalate) and poly(ethylene sebacate) were easily gelated. However, poly(trimethylene terephthalate) and poly(neopentyl terephthalate) were scarcely gelated. The primary reaction leading to crosslinking is assumed as follo

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Author

Kentaro Yoda; Akio Tsuboi; Minoru Wada; Reizo Yamadera

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

1970

Language

EN

Field

Materials Science (Physical Sciences)